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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47d9513e283fe58591598f35d7afe2e0a61c7afa21e8f8ed02d15706d99d0c6' 
  AND token = 'rzxjnTaCZ6IZzxwIIyhCfsYwzzYVzH2Bm4X1lBKSDO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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