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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67502ae516b8d184aa4d8cd6467b30f59f5d875fbc19463dc4653f803dcb7a27' 
  AND token = 'GQJ9U7rmSse/c0J6n9A3Z5tmkotryPsfKCp5UkDZLKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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