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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb66f7c758b585ffef4c64b14079d4ebb8b5256e31ed53656dbbcb5d6c8ddaf8' 
  AND token = 'bBhwRx5vkGdPJXQ0wsTYzk6eMSnHvokE6kkzE6/INss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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