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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b129711b2471e53d7a6af5ae41c749c40d4815efaf244ec65444e68d453e5151' 
  AND token = 'uXRhmRsnhtOk+Tush5N0PX6Iz0m9MbeXq265LZRId0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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