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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb36f302e7f1eb1563eaf17d08798cd2a660b9434e4a47da3fbb29ce21e8d43e' 
  AND token = 'q2COdbC92iKmTQuG04Aes1wE3g+QFIRhs0EpjA0ZE1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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