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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc2fa2f070d070a3c9e28b14b0dd475a7ac5a4932351037b350231d8f040b9a' 
  AND token = 'tAWvPaXEPlf47bYqQ3uKacigPhF6kVLig5hisNAkHUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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