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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30df40f9e41c6cd11726e732c72844ba1c6ae5ec0431fe82e7705ebf85da2449' 
  AND token = 'IezTa8uDYIxQH3dTzPar4G2JdjLhSKQLrQY0lwKN+SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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