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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf61836f259ac5a09298c31f047724030a4d3a8967e5db62cfa236076ea4f266' 
  AND token = 'Op+YWa60mJnHARJ8OGTZ8wKVyA6QZYAa9SXbG27T55E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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