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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f42b3f84686f518ce7574b076bd307bb1517cf4a757426efa8dbe2025b13b084' 
  AND token = 'b1p/gDhg1KLDTwjSQfDEU6p0fuu2j0Dx6VQcWmKTRgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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