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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d0dfe261d9e40f0e84fc55c494b3a41d4332748973ffded0f20bbfe33f41265' 
  AND token = 'X+uZcDZUgldsZ9CobblwrH3J7qD3jGBBSX5xWyskyvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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