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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19bdcd5dfee3f2dd509ea7076f31449e916f15ed9a0534e0eb85e596820c94b2' 
  AND token = 'KzTpxPG/pT3RxGm0TdHbS1d/d7jzoej74XAi8dypt5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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