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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40aa1ebe63e33332f11ffda6fe5a227a675aca629ac886228c5e8c30c2459648' 
  AND token = 'HF+WUWNIdDMq0fgb8/PwF+Li9iofP1d6SWukucqGqK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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