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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e87601d1b7eea82dc92de8b1c97ce49f71273f07343b887cf8ed251dd81546' 
  AND token = '56CAp7nmJZ78Dg6DXLjftD1AI13mQ34yDU1IXDC0+DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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