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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab810ce9c3dce236c89423cd2490a6eb5b6c8bceb75196137c1632c0b22fbe36' 
  AND token = 'fMJlvgzqApcZ2coVzgSLUrqen/4RQhlU8r0L19uEARI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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