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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903b86f62847f74da330abeb62789253ec6abb98ef904a0ab0c4b6f7e2ffd6f6' 
  AND token = 'Ki4fgmgIdsNY8zpZFm6ykRUAkRPZ7uyh6KnrLo3c92I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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