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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055f99546e3034f03a8755db132e4b127c41d803b77cd091961c08a5ffc4f5e1' 
  AND token = '4brB71sY/65W9W9fEefhx/QsTubVk/Psv75cYfLB6r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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