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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b9e38e1094386e0ba2c8a5a13057b2cde732e4c76b1f4e3117e522b6c5659e9' 
  AND token = 'LsWYlqW/QyTApGzHBna8i1c+URwWc1Uit0C1sXx53l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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