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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab982818896c367215825c1880f7b4471b2be20dab54e9321755f6ef779fb1e0' 
  AND token = '/0P+DTQb9j5znvwFuv7smtvHR8lauVedWW7CBpCMvDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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