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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9770c9b7632f7f10bff0fae572b8faf571897d9d894ecb5a19baa0c1fe45a8' 
  AND token = '+Qw2GPJ0Kac5ZO790HUXq+o7ppmGXIEZDynX4/3BeV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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