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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7999284b8d85abe4704f9dc20f8d673610a6493ea5578af19f993452c920ec6b' 
  AND token = 'WiSTD2u9U5FukiKLa7/m6yj46vamCyn7VRbGDXzYC6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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