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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59cb63eb37df10bcf2ef6660eb6c266b7a5cc357f19ca83cc4af6f7226047bf8' 
  AND token = 'qtRwJl4GoDtZt0JX7qZstTIU3P1x5bvGFWRETKSRmhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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