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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9477acbd3d1036fd59cc5cc9d87b6afef14afa9e2b9ee4abf1d00b744b46a82' 
  AND token = '0j55IN5Oig703qxTrDTU53/oxTXlKlPFx/HKQkbHFjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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