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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b3106e46e5a898461cfd62eaf15f6f347f7c1ec691bce3179fdcbbf5fac612' 
  AND token = 'Cy4RUS5X45v4VM9blV9hMNeJD+MhFfjKxOYltnNvU+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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