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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56df54bd7728940fec98e873282c78fa295682e76fdf6271db32bd84b0aefb5d' 
  AND token = 'w0VKOM8umzPXsZVx7uhI2bZPtIP3952YR1Ps1f11kbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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