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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d2849743f82c68a2c935d92110f60a09db9b59727a9a1dd7489f25ebc099972' 
  AND token = '77VSJKZ65ZVYKlV3OwSEyQvo977zb0yDS7n93CpYdd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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