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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dceb9239c7f254802c86f004501d9e233159fd198c9ba65ef45b162dc554a4d' 
  AND token = '5uT64XsX4SV+JFHMWwU/fLr1HeT18r/rKLOH+4CF7DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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