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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c823a19d72422336d20857bc941fa16216465035a88d3032cf7d7236ca3e504' 
  AND token = 'nyqe+0517yE/F6L7L8biyvs2xdIhanYXNwBySqktnwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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