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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e2a7d0e9b1a7fd97c8684c842a0418877bc6a903399892dbc716354ab48aede' 
  AND token = 'KMag+qkTo2CQ9FdnNHrgHix4Hsj2hYIh4BDMjoybLYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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