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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1865fdcb4968b7d1cf3a10eb1b38393a51fe804ff1b2c228dee2c8fa607da0d3' 
  AND token = 'SdMudrA39aUvcPkjN1ZgBFDq8n8fCJu3hFSWI1DO7S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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