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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31c03f3986ab11fdf656e718bd2f076dc38c25628124bb3467e29b1e77cd973' 
  AND token = 'KKIPjPiRaBlDgBQAY9E1HiS35DY1eXh8arD/ciU5nGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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