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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a2ecf10af11d2f1c35c97228e880717d587f689c38b6e46bb3f0a35648301f' 
  AND token = 'x4vzdsqjQUDX0CS5Pr3/kfs0AzCrr5agX77vPD2lY3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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