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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'facc1bf7878a1ed37e41fc2b90130271b0b49e8f763ecfa06e5a16a56035352c' 
  AND token = 'mehAAUrQG//3F4ifJe20GgHN7gVFLlO+FlxcubJpMNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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