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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'addd9aa97a99a513cb7fee30d7a5512184d1a0f27add8a50a71acd25786619ab' 
  AND token = 'AwYlbDjE3m7aUnr2T/8BxHC/noL/R0LCwucirHRGzno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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