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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0d85b2abf95fb524230142be144c8764dc43277eddb5d8d776a510fa48ab1a' 
  AND token = 'V99FtfoUBz6hyOPcmuEh1bYPCicSx2FTbugSOaqiQD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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