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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5eb1d650cf95b9bf94426dc71b8672fd6d2c061c43b4116ad024d5adda01a83' 
  AND token = 'FsPlnzW5poJ5yQsb/FujgaMUh29u52gK0UztkD9xXQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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