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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0eda4a7125071753fb527462ccf6337bbcb93b1dc3e57a25cb0ca9a9d905e6' 
  AND token = 'DCvR7efLn7dj11gZuzZXk07IjQvhDYQEH1jWGLoKpeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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