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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88d5d61e8e96a7993b104eaca315bced7839e034f83d6e660d802499c01028a4' 
  AND token = 'DNpr80shgowGc+PDg86G/dcAfcIdt1YKX/rILI5dMD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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