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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aacbc0df4e1eb729df5d180a2c12f50d7840e32c7eee3e857ca3bb08d49dd809' 
  AND token = 'pSmDN/Kjh/b1msr4MCcNbqCl8X6Aeb/RX+yK2Klxm9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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