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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec75afc13e97f624e53d5516bd1572f801fc47c9d92a1a0843c7333bbfbd88c' 
  AND token = 'XjLT7cdh2kAKV4lvLNl9u8qxiNNHHVeqXJVvmTgV+Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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