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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f59060492380c1cfda407b11168295526b9abd7074c3fde4190801cc27b4a9' 
  AND token = 'wACKqwEeorSrZK4lw9rX8z9SIiuA2a8Tt2PMPmCUz00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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