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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '765336ae1e9949e3cfe7c344e62b59dc32d0ccd89c307a3e199761a6664c45c6' 
  AND token = 'OsrdiWH32FwpLKXzHjuKUGuUXofo96XQsHXT+GoIu/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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