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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d564cf4804e8890e677ca3b543066920f515e1d83ebead06c0a2abd64f3ada9' 
  AND token = '32AseUrZTRnRsiX5ahDyA/0HPcKfi+paO1XQudrVX2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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