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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ecc3c627b50c103ed5086d7d63b8690c22ac27d4810086e0cf891f14b9ecb23' 
  AND token = 'qc6CtBQkZCmp5Gt6Kl9yKfm/mIPBoaI1XuKrBRZmGuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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