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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5661c0d219e18f5da3037a3cf7a16b12bd44c7d83a112fc9f152d62ef403aa' 
  AND token = 'MTPwMnWG7z/ByvNRnWbqS2ybjqZe5A1NLnCnPGBZuyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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