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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f3c93b457c6f24ee5e67c51f5af16af255ade2d6fe1a3086811b25f71b0996' 
  AND token = 'GkeeMsw5JsCIq4FzC/BcFfvZgR4OmlP8XA5Z1B3Zs74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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