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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56cac805cde0f7c64367df7fcde07f69b0d8cb3f56fc0450ce1f73e2ce15bf6d' 
  AND token = '1YLCSE4cArUA2OL935ETsNBd/Jfmjmv6EqoNIKg5z/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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