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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b399172059de408e9cea66543ea7f884f68ccd9753e6d7a7e17e848180898d3' 
  AND token = 'nBWSKaT6d2h2PWbHkC8j3sQYE1Mwz8G1K9qK/rnkJUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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