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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4c40cb2d7af1d2ceef413fe5ed061858dfd1ca960177ad8c22998fbe87e0eb' 
  AND token = 'qbqOztz8P3P49HwvV8QBeNLTp7d4MSIWhIhookvHoXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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