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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97277f029c05efd8ef5152ebeb2b67af1d782fc78e8f9d24a7070c94bc7f6d0' 
  AND token = 'WnasbHoe2niPasJPs8ovUuU8M8Ns8KO4bgfb9WYkvTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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