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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe13587402471b36474a765d0c94511ee3e1a06aa5fdd53c1c1163c0100542d8' 
  AND token = '7ttoS83LgEGGXj2p97zeLopxV1SCqhzCkANHUqOd4Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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