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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b8a31e93f0fa80d35885b3af21604281036b09fc343d8557f9843d2b7f3d7de' 
  AND token = 'wEFbUlH5r4kFTsGt1zEDK3/AXaApXMjxjMGYN+F6snM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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