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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '569fb21617000e17b8199b865a5851ffa783509ffc9b58c06037b3fd1adb4395' 
  AND token = 'AlY5bXE5HF5+/q/65atxDpf5i95ND6bq+vyhctrDJAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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