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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d47b4ab3f3d00e23c69edeba522627bcc85522540ad1020e5989d0ed5a82c3' 
  AND token = 'WFr7ZdeivyBoToVrj5UVm3jC52xnA5zgV2cv34ThMtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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