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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6bb7314b0bd6cf80356f31d0fa4366d6c0c2b48c98d2fb84417a35893168d0' 
  AND token = 'N0qdDCdSxditUTvmkrvJcnQYUt9lLKt8L/0inJiKOns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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