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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46af44ed51b4d17cd41aec626a89262f2e16ed62c7f1e5826aa1d9ddcc92ba89' 
  AND token = 'Bq5UuIyLv8727gjQQSCeEQE8s3YegFy5KnM7GUmU0BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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