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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76665961a65aa5efabf4e0cdc5b39c9bbad28d42bd1e84f2aac91f951ba8967a' 
  AND token = 'buZMAbAUcgboxxfG3pYqcowUid8kNv9YKRbzspYuXZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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