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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa92c93b46c96c62b295e63ca8718c904ea8924a3210b11c08cc7fcbe3e3ae97' 
  AND token = 'gK8Id2LmQevHGbT+LujIxG3NnX9mF0rrwlDhx3P4reA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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