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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73b762b79fb3ae3eb870a0fe5709029942bb2e5b469f3e2dd8459cfd0d24fbcb' 
  AND token = 'KRclWuqejYunX6vhbawI+7Fn2QxaEP0G1phsP9k1BZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}