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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0927bee5cbdfd102839dc38a2cc99d3bcb21e73ca0a33245b144352a8f295987' 
  AND token = 'gk+U/1bWE/CdYQfZQDM8ya4ukT+reAFyRqOy+gXqU5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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