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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7688a59c9b74499fd34916ce1732f5564f41ffa2958b5a13288bd3c86b5f4e16' 
  AND token = 'x3rb6HczUhh4ZVOw+aYT0ys9r1cWgI/OpoUV3C1cDDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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