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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58bd8dfc1e71f26573e60861d830d6b222030ea9987b9a999688ca2618eb20b2' 
  AND token = 'rYCVgyfX9j2WpMIcJiVnmeci6I2EEX8BM7J30w3vfqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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