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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2025c63f0e87f3012708f4aae70f98dc9d18cd4ba80b448b7c4698846a518a5c' 
  AND token = '2hRF12ivYKbGkc29I70dJIIgRz958p+79tYqU4bDlxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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