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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee84b92ae825075c69c7760240ca9d976a210d5b6bd0483fb84b7bcd301cd4e' 
  AND token = 'R7QWyR6o5ZJZyNgMEo9hgBj4w1Pm0NnxCR0MIK923dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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