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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0866da6d2f77f1cf9f7c1471e270a65eebbc9d7fec5d591f4988e2b29b569ac' 
  AND token = '7IwvQxX8brFAJ9Ld/buGRL0WMCd5TmuYl/MIV5nHdHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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