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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c347730c2d3e0ffabd07351fcc87f1daba2748ed5784578a7ebae3ba48c6285b' 
  AND token = 'kz6clSpI43VybuAfvSp2JwXhJmuoizsNuhmvXy6uri4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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