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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '895d300c27536a586ff63fafa13602123eb151378e618be185595a60f0357e73' 
  AND token = '0ieYrxLX29jVHolINHfhOUA8F/tVrpLygCkz4Oel/b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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