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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc459fac74b59cce594490d7e16cd44bda2bf811e456e8d9d574cc9581753327' 
  AND token = 'LCzY5PIHad228w9e3dTWM3NjwxCPfQOPmSvBcsJZnLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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