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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a92722a3ca9990ed4c3f403e97db5d9fd4c06bd0977ce8e96caf092855a42eeb' 
  AND token = 'RW/mEk4e/c0QMMckHak6lsgduqCwAnrnBom2MNvTqLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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