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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff2a57c4e1e4ecebca67cd0df03008194447befabe4a98162c47dee81338188' 
  AND token = 'ukQhHZJCL6F7/dzmuEeR3RPnulvy/1NZOqlvSppZg4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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